One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6)(7,13)(8,16)(9,11)(10,15)(12,18)(14,20)(17,19)(21,22)(23,31)(24,27)(25,29)(26,30)(28,32)(33,36)(34,35)(1,3,4,2)(5,7)(6,10)(8,17)(9,14)(11,19)(12,20)(13,16)(15,18)(22,27)(24,25)(28,35)(29,30)(31,36)(32,33)(21,23)(22,28)(24,32)(25,33)(26,34)(27,35)(29,31)(30,36) involution — undirected(6,11)(7,14)(12,16)(15,17)(21,24,26,25)(22,27,30,29)(23,32,34,33)(28,35,36,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.